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key·stone
 keystone
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- pronunciation:
- ki
ston
- features:
- Word Combinations (noun), Word Explorer
| part of speech: |
noun |
| definition 1: |
the central, wedge-shaped stone at the top of an arch.
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| definition 2: |
something upon which other things depend; crucial part or element.
the keystone of her scientific theory- similar words:
- fundamental, keynote
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| related words: |
backbone, heart |
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